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Hamiltonian Mechanics and Completely Integrable Systems

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✓ 38 results · all verified · 38 also independently AI-judged
Every result on this page is machine-checked by a proof checker and read in full and owner-audited; the judge is an additional, independent cross-model AI review of the proofs; all 38 also cleared it.
1 · Prerequisites
Abstract Algebra
Combinatorics
Coxeter Groups
Differential Geometry
Linear Algebra
Measure Theory
Number Theory
Real Analysis
Set Theory
Topology
2 · Logical flowchart

3 · Items

Definition

Symplectic vector field

Proposition

A vector field is symplectic iff ι_Xω is closed

Definition

Hamiltonian vector field and Hamiltonian function

Theorem

Hamiltonian vector fields exist uniquely for smooth functions

Proposition

Hamiltonian vector fields are symplectic and symplectic fields are locally Hamiltonian

Proposition

Hamiltonians for a fixed vector field differ by a locally constant function

Theorem

Symplectic vector fields modulo Hamiltonian vector fields are first de Rham cohomology

Theorem

Hamiltonian flows preserve the symplectic form

Proposition

A Hamiltonian is conserved along its own flow

Definition

Poisson bracket on a symplectic manifold

Proposition

The Poisson bracket is bilinear, skew, and a derivation in each entry

Theorem

The Hamiltonian vector-field map is a Lie antihomomorphism

Theorem

The Poisson bracket satisfies the Jacobi identity

Theorem

Smooth functions form a Poisson algebra

Proposition

Observable evolution equation

Definition

First integral and Poisson-commuting functions

Proposition

F is a first integral of H iff F and H Poisson commute

Theorem

Hamiltonian flows commute iff their Hamiltonians Poisson commute up to locally constant bracket

Theorem

Hamilton equations in canonical cotangent coordinates

Proposition

Coordinate formula for the Poisson bracket

Proposition

The cotangent lift of a vector field is Hamiltonian

Definition

Time-dependent Hamiltonian vector field and flow

Proposition

Time-dependent Hamiltonian evolution is symplectic

Definition

Canonical transformation

Theorem

Liouville volume preservation

Corollary

Hamiltonian flow has zero divergence with respect to symplectic volume

Definition

Liouville vector field on an exact symplectic manifold

Proposition

The canonical Liouville vector field on a cotangent bundle is radial in momenta

Corollary

Poincaré recurrence for finite-volume Hamiltonian invariant regions

Definition

Lagrangian action functional on curves

Theorem

Euler–Lagrange equations

Definition

Fibre derivative or Legendre map of a Lagrangian

Definition

Regular and hyperregular Lagrangian

Definition

Energy and Hamiltonian of a hyperregular Lagrangian

Theorem

Equivalence of Euler–Lagrange and Hamilton equations for hyperregular Lagrangians

Proposition

A natural mechanical Lagrangian gives the kinetic-plus-potential Hamiltonian

Definition

Completely integrable Hamiltonian system

Proposition

Regular common level sets are Lagrangian submanifolds

Proposition

Commuting Hamiltonian vector fields integrate to a local ℝⁿ-action

Lemma

Stabilizer of the ℝⁿ-action on a compact connected regular fibre is a full lattice

Theorem

Compact connected regular fibres are tori

Definition

Action and angle coordinates

Theorem

Liouville–Arnold action–angle theorem

Corollary

Motion of a completely integrable Hamiltonian is linear on invariant tori

Proposition

Period-lattice monodromy obstructs global action–angle coordinates

False statement

Every symplectic vector field has a global Hamiltonian function

False statement

Hamiltonian functions for one vector field differ by one global constant on a disconnected manifold

False statement

H↦ X_H is a Lie homomorphism under the library Poisson convention

False statement

Hamiltonian flows are complete on every symplectic manifold

False statement

n independent first integrals automatically form a completely integrable system

False statement

Liouville–Arnold gives global action–angle coordinates on the entire manifold

Sources